<!doctype html>
<html>
<head>
    <meta charset="UTF-8">
    <title>测试</title>
</head>
<body>
<!-- Stack the columns on mobile by making one full-width and the other half-width -->
<div class="row">
    <div class="col-xs-12 col-md-8">.col-xs-12 .col-md-8</div>
    <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div>
</div>

<!-- Columns start at 50% wide on mobile and bump up to 33.3% wide on desktop -->
<div class="row">
    <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div>
    <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div>
    <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div>
</div>

<!-- Columns are always 50% wide, on mobile and desktop -->
<div class="row">
    <div class="col-xs-6">.col-xs-6</div>
    <div class="col-xs-6">.col-xs-6</div>
</div>
</body>
</html>